16631247 has 4 divisors (see below), whose sum is σ = 22175000. Its totient is φ = 11087496.

The previous prime is 16631233. The next prime is 16631249. The reversal of 16631247 is 74213661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16631247 - 2⁷ = 16631119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2771872 + ... + 2771877.

It is an arithmetic number, because the mean of its divisors is an integer number (5543750).

Almost surely, 2^16631247 is an apocalyptic number.

16631247 is a deficient number, since it is larger than the sum of its proper divisors (5543753).

16631247 is an equidigital number, since it uses as much as digits as its factorization.

16631247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543752.

The product of its digits is 6048, while the sum is 30.

The square root of 16631247 is about 4078.1425919161. The cubic root of 16631247 is about 255.2553996318.

It can be divided in two parts, 166 and 31247, that added together give a palindrome (31413).

The spelling of 16631247 in words is "sixteen million, six hundred thirty-one thousand, two hundred forty-seven".